I am holding to my own Greek grammar studies for almost 40 years! If you can show that I am in error, then please feel free to show me. I am very much open to correction and learning, as we all what the Truth of what the Bible teaches.
The Septuagint and New Testament were written in Koine (common) Greek.
Perhaps this below, a small excerpt, will help to assure you in your Greek studies that Jesus was God.
Logos =
What Does the Bible Say About Logos?
Excerpt:
In the
Granville Sharp Rule, when two singular, personal, non-proper substantives of the same case joined by
kai are governed by a single article, the same person is usually being referred to. We see this in Titus 2:13.
Titus 2:13, “tou megalou theou kai soteirous 'eimon Yeisou christou.”
Tou = Article, Genitive, Singular
Theou = Noun, Genitive, Singular
Kai = Conjunction (Copulative Kai)
Soteirous = Noun, Genitive, Singular.
"When the copulative kai connects two nouns of the same case, if the article ho or any of its cases precedes the first of the said nouns or participles, and is not repeated before the second noun or participle,
the latter always relates to the same person that is expressed or described by the first noun or participle" (A Manual Grammar of the Greek New Testament, p. 147).
The Official Blog of Duane Cartujano : Is the Granville Sharp Rule refuted by the text of Psalm 35:23?
As should this if we take John 1 as written and bring verses together that are separated otherwise by other verses. This to provide a singular message in the text. The Greek Interlinear bible version is also at this link.
John 1 MOUNCE;KJV;NIV - In the beginning was the Word, and the - Bible Gateway
1 In the beginning was the Word, and the Word was with God, and
the Word was God.
2 The same was in the beginning with God.14
And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.